Browsing by Author "Orak, Abdulkadir"

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Investigation of Tensile Strength and Hardness Behaviour of Hardox500 – St52 Specimen Joined by Gmaw Method
(Konya Technical University, 2020) Korkmaz, Şeyma; Çetin, Muhammet Hüseyin; Adar, Muhammed; Orak, Abdulkadir
In mechanical construction, meeting different industrial requirements such as high strength,wear and corrosion resistance can be achieved by using different materials together. Especially the usageof metallic materials together is important for sustainability. The use of different metallic materialstogether depends on the joining ability of the materials andexperimental studies are needed for theanalysis of joining ability.In this study, the weldability of Hardox500 and St52 (S355) steel by GMAW (GasMetal Arc Welding) method was investigated using different current and voltage parameters. Weldabilityof two different steel alloys were examined by tensile test, micro hardness measurement, SEM andmicrostructure imaging techniques. Tensile tests were applied to the welded samples and the criticalpoints and deformation characteristics of the samples were evaluated according to the determined inputparameters. Micro hardness values of the samples were determined by Vickers (HV) hardnessmeasurement method. According to the results, it was determined that the welding capability ofHardox500 and St52 material was low at low current and voltage values and that the hardness distribution occurred irregularly. It was determined that the tensile curves at high current and high voltage values exhibited more stable behaviour and a homogeneous hardness distribution occurred.
Citation - WoS: 1
Citation - Scopus: 2
Investigation of Wear and Corrosion Resistance of Wc-Coated Pearlitic Railway Steel in Dry and Wet Conditions
(Elsevier Sci Ltd, 2025) Orak, Abdulkadir; Korkmaz, Seyma; Cetin, M. Huseyin
In this study, the effect of WC coating on the tribological performance of R260 rail steel was investigated by roller-on-plate wear tests and potentiodynamic polarisation corrosion tests carried out in dry and pure water environments. The High-Velocity Oxygen-Fuel (HVOF) method was used for the coating process. The tests were conducted with a weight of 40 N and a sliding speed of 0.03 m/s. An Ag/AgCl reference electrode was also used for corrosion tests in a 3.5 % NaCl solution. To produce cyclic polarisation curves, the experiments were carried out at a scan rate of 1 mV/s within a potential range of +/- 0.25 V. The effect of WC coating on the wear performance of rail steels was analysed quantitatively with the friction coefficient and volume loss parameters and visually with SEM and 2D-3D topography images. The effect of the coating on the corrosion performance was evaluated numerically with the corrosion potential, corrosion current intensity, and corrosion rate values, as well as elementally and visually with SEM and EDX images. Wear test results showed that the wear volume in WCcoated rail steels decreased by 43.07 % and 46.94 % compared to uncoated rail steels in dry and wet conditions. Corrosion test results showed that the corrosion rate of WC-coated rail steels was lower compared to uncoated rail steels, and the corrosive effect spread to a smaller area.